<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>面向对象 Tab</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        ul li {
            list-style: none;
        }
        
        main {
            width: 960px;
            height: 500px;
            border-radius: 10px;
            margin: 50px auto;
        }
        
        main h4 {
            height: 100px;
            line-height: 100px;
            text-align: center;
        }
        
        .tabsbox {
            width: 900px;
            margin: 0 auto;
            height: 400px;
            border: 1px solid lightsalmon;
            position: relative;
        }
        
        nav ul {
            overflow: hidden;
        }
        
        nav ul li {
            float: left;
            width: 100px;
            height: 50px;
            line-height: 50px;
            text-align: center;
            border-right: 1px solid #ccc;
            position: relative;
        }
        
        nav ul li.liactive {
            border-bottom: 2px solid #fff;
            z-index: 9;
        }
        
        #tab input {
            width: 80%;
            height: 60%;
        }
        
        nav ul li span:last-child {
            position: absolute;
            user-select: none;
            font-size: 12px;
            top: -18px;
            right: 0;
            display: inline-block;
            height: 20px;
        }
        
        .tabadd {
            position: absolute;
            /* width: 100px; */
            top: 0;
            right: 0;
        }
        
        .tabadd span {
            display: block;
            width: 20px;
            height: 20px;
            line-height: 20px;
            text-align: center;
            border: 1px solid #ccc;
            float: right;
            margin: 10px;
            user-select: none;
        }
        
        .tabscon {
            width: 100%;
            height: 300px;
            position: absolute;
            padding: 30px;
            top: 50px;
            left: 0px;
            box-sizing: border-box;
            border-top: 1px solid #ccc;
        }
        
        .tabscon section,
        .tabscon section.conactive {
            display: none;
            width: 100%;
            height: 100%;
        }
        
        .tabscon section.conactive {
            display: block;
        }
        
        @font-face {
            font-family: "iconfont";
            src: url('./iconfont/iconfont.eot?t=1553960438096');
            /* IE9 */
            src: url('./iconfont/iconfont.eot?t=1553960438096#iefix') format('embedded-opentype'), /* IE6-IE8 */
            url('data:application/x-font-woff2;charset=utf-8;base64,d09GMgABAAAAAAK4AAsAAAAABmwAAAJrAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHEIGVgCCcAp4fwE2AiQDCAsGAAQgBYRtBzAbpQXIrrApw71oi3CCOyzEy8RvE4yIN8TD036/zp03qCYRjaJZNBFFS/gREoRGipQKofjuNrb+9XbTqrmXcqWzfTRDqFqWkhAJzYToaE6LQ7Q30CirRqSKMnj58DdIdrNAdhoTQJa5VGfLrtiAy+lPoAcZdUC57UljTR4TMAo4oL0xiqwYG8YueIHPCdTqYajty/t+bUpmrwvEnUK42lQhLMssVy1UNhzN4kmF6vSQVvMY/T5+HEU1SUXBbti7uBBrx++cgqJULp0GhAgBna5AgSkgE0eN6R1NwTitNt0yAI5VG7wr/8AljmoX7K+zq+tBF1Q8k9JTPWp1AjnJDgCzmM3bU0V31dsvV3M2eC6fHjaGfX/qS7U5Gr58vj6uD0bgxudyrV/OtHHyP+NZnpO1txbktjdY+3FB61+7nxeOzq8niGYnRwT3v3aZxeXf6rrNxl5//49WlEtZUUL1Pj3Bv1EO7MuG2namrCkbvcnApLUJtWpRhv2tzlRLx43kQ7WO2/FW6c5QqDZEZnYKFeosoVK1NdSa5E/XaVM1Ra7BhAEQmk0kjV5QaLbIzG5U6HRRqTkK1DqJtivrjMT1zJaNnIsihAiyQE3JdbszcW0Xiadzdl4d8UO0HSUGNDNXzl2hifYSO5pPjrorgdjUAAavoa5TKDZVUXD3kuuOOzh70fShvUiN2owtNsRxIREIIiATUCYpGO2aqXy/CxEeHcfuaKrLDiGbQ5kcEMsNIK8M5qCmR3mn8RFHOpcECBtlAAwWIZ2OAqV5kQoJXHvShORYBzrDZKhhb3uT8QPlrA3bmsKZV6i89DiTV2o1AAAA') format('woff2'), url('./iconfont/iconfont.woff?t=1553960438096') format('woff'), url('./iconfont/iconfont.ttf?t=1553960438096') format('truetype'), /* chrome, firefox, opera, Safari, Android, iOS 4.2+ */
            url('./iconfont/iconfont.svg?t=1553960438096#iconfont') format('svg');
            /* iOS 4.1- */
        }
        
        .iconfont {
            font-family: "iconfont" !important;
            font-size: 16px;
            font-style: normal;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        
        .icon-guanbi:before {
            content: "\e676";
        }
    </style>
</head>

<body>

    <main>
        <h4>
            Js 面向对象 动态添加标签页
        </h4>
        <div class="tabsbox" id="tab">
            <!-- tab 标签 -->
            <nav class="fisrstnav">
                <ul>
                    <li class="liactive"><span>测试1</span><span class="iconfont icon-guanbi"></span></li>
                    <li><span>测试2</span><span class="iconfont icon-guanbi"></span></li>
                    <li><span>测试3</span><span class="iconfont icon-guanbi"></span></li>
                </ul>
                <div class="tabadd">
                    <span>+</span>
                </div>
            </nav>

            <!-- tab 内容 -->
            <div class="tabscon">
                <section class="conactive">测试1</section>
                <section>测试2</section>
                <section>测试3</section>
            </div>
        </div>
    </main>

    <script>
        var that;
        class Tab {
            constructor(id) {
                that = this;
                this.main = document.querySelector(id);
                this.lis = this.main.querySelectorAll('li');
                this.sections = this.main.querySelectorAll('section');
                this.add = this.main.querySelector('.tabadd');
                //li的父元素
                this.ul = this.main.querySelector('.fisrstnav ul:first-child');
                this.fsection = this.main.querySelector('.tabscon');
                this.init();
            };
            init() {
                this.updateNode();
                //init 初始化操作让相关的元素绑定事件
                this.add.onclick = this.addTab;
                for (var i = 0; i < this.lis.length; i++) {
                    this.lis[i].index = i;
                    this.lis[i].onclick = this.toggleTab;
                    this.remove[i].onclick = this.removeTab;
                    this.spans[i].ondblclick = this.editTab;
                    this.sections[i].ondblclick = this.editTab;
                }
            };
            //切换功能
            toggleTab() {
                    that.clearClass();
                    this.className = 'liactive';
                    that.sections[this.index].className = 'conactive';
                }
                //清除函数
            clearClass() {
                    for (var i = 0; i < this.lis.length; i++) {
                        this.lis[i].className = '';
                        this.sections[i].className = '';
                    }
                }
                //获取所有的小li和section
            updateNode() {
                    this.lis = this.main.querySelectorAll('li');
                    this.sections = this.main.querySelectorAll('section');
                    this.remove = this.main.querySelectorAll('.icon-guanbi');
                    this.spans = this.main.querySelectorAll('.fisrstnav li span:first-child');
                }
                //添加功能
            addTab() {
                    that.clearClass();
                    //alert(11);
                    //创建li元素和section元素
                    var random = Math.random();
                    var li = '<li class="liactive"><span>新选项卡</span><span class="iconfont icon-guanbi"></span></li>'
                    var section = '<section class="conactive">测试' + random + '</section>';
                    //把这两个元素追加到对应的父元素里面
                    that.ul.insertAdjacentHTML('beforeend', li);
                    that.fsection.insertAdjacentHTML('beforeend', section);
                    that.init();
                }
                //删除功能
            removeTab(e) {
                    e.stopPropagation(); //阻止冒泡
                    var index = this.parentNode.index;
                    //console.log(index);
                    that.lis[index].remove();
                    that.sections[index].remove();
                    that.init();
                    if (document.querySelector('.liactive')) return;
                    index--;
                    that.lis[index] && that.lis[index].click();
                }
                //修改功能
            editTab() {
                var str = this.innerHTML;
                //双击禁止选定文字
                window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
                //alert(11)
                this.innerHTML = '<input type="text" />';
                var input = this.children[0];
                input.value = str;
                input.select(); //文本框里面的文字处于选定状态
                //当我们离开文本框就把文本框的值给span
                input.onblur = function() {
                    this.parentNode.innerHTML = this.value;
                }
                input.onkeyup = function(e) {
                    if (e.keyCode === 13) {
                        //手动调用表单失焦点事件  不需要鼠标离开操作
                        this.blur();
                    }
                }
            }
        }
        var tab = new Tab('#tab');
    </script>
</body>

</html>